Akrapovic's DP

lito · 12-07-2011, 01:12 PM

Another downpipe option for the N54. What do you guys think.

http://hpashop.com/Exhaust_c272.htm

blisstik · 12-07-2011, 01:15 PM

Damn. That looks super legit with the flex section.

NiVeDh · 12-07-2011, 01:21 PM

As nice as Akra products are, these look like 2.5".

M-POWERED- · 12-07-2011, 01:26 PM

Ordered them. Gonna try to fit these on xi in January with new turbos, should not be a problem

lito · 12-07-2011, 01:26 PM

Price reasonably as well. I wonder if they will come in Ti.

CPWINCH · 12-07-2011, 01:31 PM

Quote:

Originally Posted by lito

Price reasonably as well. I wonder if they will come in Ti.

idk about the n54 dps but my n55 dp by ar is light as is. making it Ti would be a huge waste of money

ar design · 12-07-2011, 01:32 PM

I saw those a week or so back, they look to be very well made! We actually carry them, if anyone is interested!

rader1 · 12-07-2011, 01:38 PM

I thought those had been around for a while

They were up on Akra's site a few months ago when i was looking at their exhausts. I could be mistaken...

lito · 12-07-2011, 01:41 PM

Quote:

Originally Posted by rader1

I thought those had been around for a while

They were up on Akra's site a few months ago when i was looking at their exhausts. I could be mistaken...

The site says they will be available by the end of Dec.

lito · 12-07-2011, 01:42 PM

Quote:

Originally Posted by NiVeDh

As nice as Akra products are, these look like 2.5".

I hope not, that would be a letdown

rader1 · 12-07-2011, 01:45 PM

Quote:

Originally Posted by lito

The site says they will be available by the end of Dec.

I guess thats what i saw. But i just read a bimmerpost facebook post about a 1M already running the Akra catted DPs, maybe it was special order or something.

bryce · 12-07-2011, 01:52 PM

they're most likely 2.5" from the pics, but it looks like they're similar to the CP-e downpipes; i.e. larger, bell-mouth opening for the turbo, tapering to 2.5" after a few inches.

bigdaddycane · 12-07-2011, 01:58 PM

Different design (factory flex area) and reasonable price....very nice!

sA x sKy · 12-07-2011, 02:08 PM

Quote:

Originally Posted by rader1

I guess thats what i saw. But i just read a bimmerpost facebook post about a 1M already running the Akra catted DPs, maybe it was special order or something.

http://www.youtube.com/watch?feature...&v=3ST54Dt_XsY

1M with a full Akra setup..posted this in the N55 section a few days ago.

nitehawk · 12-07-2011, 02:16 PM

Is this new? I really like the factory style flex pipe. Akra stuff at a reasonable price - very cool!

dbjb · 12-07-2011, 02:20 PM

Very nice indeed. However, I too think they're 2.5".

Brey335i · 12-07-2011, 02:30 PM

HPA already said that these are doubling in price soon. I'd still pick AR, but these look nice.

M-POWERED- · 12-07-2011, 03:55 PM

Quote:

Originally Posted by Brey335i

HPA already said that these are doubling in price soon. I'd still pick AR, but these look nice.

What is the reason of doing this now?

I think Akra is better, as it is technically closer to oem design

nitehawk · 12-07-2011, 04:01 PM

^Yup. My rear center console vibrates during light accel with my DP/exhaust setup. Flex pipes would allow for some give and prevent such NVH issues.

Syndicategt · 12-07-2011, 04:13 PM

How much difference does the 3" make over the 2.5" when it will eventually taper down to 2.5" before it meets the mid pipes? I understand the pressure imediately after the wastegates will be less but eventaully it bottlenecks at the tapered section. I know it's been discussed in the past, and 3" pipes have shown more gains, I just don't understand the physics behind this.

*Same goes for intakes and larger chargepipe diameters when the turbo inlets are extremely restrictive to begin with. I'm guessing air would just have to move faster if the pressure is constant.

dbjb · 12-07-2011, 04:23 PM

Quote:

Originally Posted by Brey335i

HPA already said that these are doubling in price soon. I'd still pick AR, but these look nice.

WTH? $1600 downpipes. Not even if I had money to burn.

Brey335i · 12-07-2011, 04:46 PM

Quote:

Originally Posted by dsbj

WTH? $1600 downpipes. Not even if I had money to burn.

Quote:

Originally Posted by HP Autowerks

In 2012 these will double in price.

Quote:

Originally Posted by Syndicategt

How much difference does the 3" make over the 2.5" when it will eventually taper down to 2.5" before it meets the mid pipes? I understand the pressure imediately after the wastegates will be less but eventaully it bottlenecks at the tapered section. I know it's been discussed in the past, and 3" pipes have shown more gains, I just don't understand the physics behind this.

*Same goes for intakes and larger chargepipe diameters when the turbo inlets are extremely restrictive to begin with. I'm guessing air would just have to move faster if the pressure is constant.

3 > 2.5 that's all that matters lol.

12-07-2011, 01:12 PM	#1
lito Colonel 167 Rep 2,174 Posts Drives: E92, F30 Join Date: May 2009 Location: DC metro iTrader: (11)	Akrapovic's DP Another downpipe option for the N54. What do you guys think. http://hpashop.com/Exhaust_c272.htm __________________
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12-07-2011, 01:15 PM	#2
blisstik Lieutenant Colonel 151 Rep 1,677 Posts Drives: E92 Join Date: Jul 2009 Location: California iTrader: (14)	Damn. That looks super legit with the flex section.
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12-07-2011, 01:21 PM	#3
NiVeDh Major General 422 Rep 8,003 Posts Drives: '08 E90 335i, '99 E36 M3 Join Date: Apr 2009 Location: Houston, TX & Atlanta, GA iTrader: (132) Garage List 2008 BMW 335i Sedan [8.66]	As nice as Akra products are, these look like 2.5".
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12-07-2011, 01:26 PM	#4
M-POWERED- Private 11 Rep 70 Posts Drives: Porsche Join Date: Jul 2010 Location: Earth iTrader: (0)	Ordered them. Gonna try to fit these on xi in January with new turbos, should not be a problem
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12-07-2011, 01:26 PM	#5
lito Colonel 167 Rep 2,174 Posts Drives: E92, F30 Join Date: May 2009 Location: DC metro iTrader: (11)	Price reasonably as well. I wonder if they will come in Ti. __________________
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12-07-2011, 01:32 PM	#7
ar design 297 Rep 4,408 Posts Drives: 04 M3 Join Date: Jan 2008 Location: Denver, CO iTrader: (9)	I saw those a week or so back, they look to be very well made! We actually carry them, if anyone is interested! __________________ -Critter
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12-07-2011, 01:38 PM	#8
rader1 Banned 70 Rep 2,197 Posts Drives: Cobb Stage 2+ 135i Join Date: Apr 2011 Location: Roanoke, VA iTrader: (0)	I thought those had been around for a while They were up on Akra's site a few months ago when i was looking at their exhausts. I could be mistaken...
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12-07-2011, 01:52 PM	#12
bryce Banned 103 Rep 3,177 Posts Drives: zhp 3-pedal Join Date: May 2010 Location: texas iTrader: (22) Garage List 2005 bmw 330ci zhp [7.34] 2008 bmw 135i- sold [6.00] 2007 bmw 335i- sold [7.14]	they're most likely 2.5" from the pics, but it looks like they're similar to the CP-e downpipes; i.e. larger, bell-mouth opening for the turbo, tapering to 2.5" after a few inches.
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12-07-2011, 01:58 PM	#13
bigdaddycane I even mod my cereal 246 Rep 3,441 Posts Drives: 11 ZCP DCT M3 14 328d 21 GT4 Join Date: Aug 2009 Location: Northern Va iTrader: (53) Garage List 2021 Porsche GT4 [0.00] 2014 BMW 328d Xdriv ... [0.00] 2011 BMW M3 [0.00]	Different design (factory flex area) and reasonable price....very nice! __________________ 2011 Mineral White M3 ZCP - Opticoat, Ventureshield, some CF, B&B exhaust, AFE Intake Vorsteiner VFF 101s Ohlins 2014 Mineral White 328d Xdrive Wagon - Opticoat, Ventureshield, B8s, H&R, Apex SM-10s Hawk Pads 2021 718 Cayman GT4 - Fire extinguiser
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12-07-2011, 02:16 PM	#15
nitehawk Lieutenant Colonel 102 Rep 1,903 Posts Drives: e92 335i 6MT Join Date: May 2011 Location: Toronto iTrader: (15) Garage List E92 BMW 335i [9.00] E92 BMW 335i \| Retired [10.00]	Is this new? I really like the factory style flex pipe. Akra stuff at a reasonable price - very cool!
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12-07-2011, 02:20 PM	#16
dbjb I sweat pheromones 203 Rep 2,103 Posts Drives: e92 335i, retired SLK55 Join Date: Jul 2009 Location: NorCal iTrader: (25)	Very nice indeed. However, I too think they're 2.5".
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12-07-2011, 02:30 PM	#17
Brey335i Banned 112 Rep 4,771 Posts Drives: e46 ///M3 Join Date: Oct 2009 Location: Austin, TX iTrader: (11)	HPA already said that these are doubling in price soon. I'd still pick AR, but these look nice.
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12-07-2011, 04:01 PM	#19
nitehawk Lieutenant Colonel 102 Rep 1,903 Posts Drives: e92 335i 6MT Join Date: May 2011 Location: Toronto iTrader: (15) Garage List E92 BMW 335i [9.00] E92 BMW 335i \| Retired [10.00]	^Yup. My rear center console vibrates during light accel with my DP/exhaust setup. Flex pipes would allow for some give and prevent such NVH issues.
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12-07-2011, 04:13 PM	#20
Syndicategt Brigadier General 153 Rep 3,730 Posts Drives: 335i Join Date: Sep 2009 Location: Nor Cal iTrader: (11)	How much difference does the 3" make over the 2.5" when it will eventually taper down to 2.5" before it meets the mid pipes? I understand the pressure imediately after the wastegates will be less but eventaully it bottlenecks at the tapered section. I know it's been discussed in the past, and 3" pipes have shown more gains, I just don't understand the physics behind this. Same goes for intakes and larger chargepipe diameters when the turbo inlets are extremely restrictive to begin with. I'm guessing air would just have to move faster if the pressure is constant. __________________ 2008 BMW 335i e90 - Sold* - Rob Beck Turbos / PROcede V5 / Aquamist HFS-4 / AR Downpipes / AE Exhaust / ER Comp FMIC / ER CP / TiAL BOV / Custom Intake / RPI Scoops / Quaife LSD / Swift-Koni Coilovers / DSS HS / Morr VS8.2 Sig Black / Michelin PSS / P3 Boost Guage / M3 body / M3 steering wheel / Adam's Rotors / Hawk HPS / SS lines /
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